Add JUnit test report upload to Codecov for improved test result visibility

.github/workflows/test.yml

@@ -260,12 +260,12 @@ jobs:
       if: "matrix.use_coverage"
       run: python -m coverage xml
 
-    - name: Upload coverage to Codecov
+    - name: Upload coverage and test results to Codecov
       if: "matrix.use_coverage"
       uses: codecov/codecov-action@v5
       with:
         fail_ci_if_error: false
-        files: ./coverage.xml
+        files: ./coverage.xml,./report.xml
         verbose: true
 
   check:  # This job does nothing and is only used for the branch protection

changelog/12689.improvement.rst

@@ -0,0 +1 @@
+Upload JUnit test reports to Codecov to enable test result visibility in the Codecov UI.

tox.ini

@@ -62,6 +62,7 @@ setenv =
     coverage: _PYTEST_TOX_EXTRA_DEP=coverage-enable-subprocess
     coverage: COVERAGE_FILE={toxinidir}/.coverage
     coverage: COVERAGE_PROCESS_START={toxinidir}/.coveragerc
+    coverage: PYTEST_ADDOPTS=--junitxml=report.xml
 
     doctesting: _PYTEST_TOX_POSARGS_DOCTESTING=doc/en